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Title: | Heteroepitaxial growth of MgO(111) thin films on Al2O3(0001): Evidence of a wurtzite to rocksalt transformation |
Author: | Martínez Boubeta, José Carlos Botana, Antía S. Pardo, Víctor Baldomir, Daniel Antony, Aldrin Bertomeu i Balagueró, Joan Rebled, J. M. (José Manuel) López Conesa, Lluís Estradé Albiol, Sònia Peiró Martínez, Francisca |
Keywords: | Pel·lícules fines Òxids metàl·lics Cristal·lografia Estructura electrònica Superconductors Optoelectrònica Thin films Metallic oxides Crystallography Electronic structure Superconductors Optoelectronics |
Issue Date: | 2012 |
Publisher: | American Physical Society |
Abstract: | We report on a growth study of MgO films deposited on Al2O3(0001) substrates by magnetron sputtering. The films exhibited a preferred rocksalt MgO(111) orientation. Surprisingly, depending on the O2 gas flow ratio, a structure of graphiticlike wurtzite MgO(0001) has been revealed. The observed Mg-O perpendicular bond length reduction is accompanied by an atomically flat surface morphology for the development of MgO(111) films; the transition to the bulk rocksalt structure occurs in the 3-6 nm coverage range. Previously, relaxation of the electrostatic instability of MgO(111) films accompanied by an in-plane lattice increase has been suggested theoretically [Phys. Rev. Lett. 98, 205701 (2007)]. Here, relying on ab initio calculations, we infer that Mg vacancies facilitate the lattice match with the substrate. This mechanism suggests methods to engineer oxide heterostructures. |
Note: | Reproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevB.86.041407 |
It is part of: | Physical Review B, 2012, vol. 86, num. 4, p. 041407-1-041407-5 |
URI: | http://hdl.handle.net/2445/36355 |
Related resource: | http://dx.doi.org/10.1103/PhysRevB.86.041407 |
ISSN: | 1098-0121 |
Appears in Collections: | Articles publicats en revistes (Física Aplicada) |
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